The singer then took to Instagram to explain that her outfit reflects her new positive body image, after years of torturing herself with insecurities.

Posting a series of photos of herself on the VMA red carpet over the years, including the one from Sunday, Demi wrote, "This picture makes me feel so many mixed emotions.. I remember the day I wore the dress in the very first picture. I remember asking for Spanx to flatten my stomach because I use to feel so heavy and 'fat.' Now looking at this picture, you can clearly see my hip bones."

"It makes me sad because I wasted so many years ashamed of my body when I could've been living the happy and healthy life I live today," she continued. "It TRULY just goes to show you that your perceptions can lie to you. OR they can make you learn to enjoy life."

Lovato entered rehab in 2010, and her problems included an eating disorder she was open about. Years after getting help, Lovato launch her world tour at the beginning of September.

She closed by writing, "Fortunately looking at the picture of myself in the red dress...I not only feel so grateful for the love and support I've had from fans, friends and family, but... I also feel.. beautiful," she concluded. "I'm so excited to live my life the way I deserve to and to the complete fullest. Thank you guys once again.. I'm so thankful for my Lovatics. I love you... And never forget that staying strong is worth it."